CN206818746U - A kind of MHD angular-rate sensors static noise measurement apparatus - Google Patents
A kind of MHD angular-rate sensors static noise measurement apparatus Download PDFInfo
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- CN206818746U CN206818746U CN201720473039.4U CN201720473039U CN206818746U CN 206818746 U CN206818746 U CN 206818746U CN 201720473039 U CN201720473039 U CN 201720473039U CN 206818746 U CN206818746 U CN 206818746U
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Abstract
The utility model discloses a kind of MHD angular-rate sensors static noise measurement apparatus, device is made up of impedance-matching transformer module, signal acquisition module, noise analysis module and power module, impedance-matching transformer module amplifies sensing element output signal to no additional noise to realize the impedance matching between MHD angular-rate sensors sensing element and signal acquisition module；Signal acquisition module gathers impedance-matching transformer module output signal；The noise analysis module is used for separation and Extraction noise contribution；The power module provides working power voltage, prevents external noise from conducting the precision for noise analysis module, ensureing noise testing by power source path.The device can effectively suppress the coupled noise in measurement process, optimize the noise coefficient of measurement, improve the measurement accuracy of noise；Flexible modulation signal amplification factor, effective expanded noise Measurement bandwidth.
Description
Technical field
The utility model belongs to noise electronic and Technique of Weak Signal Detection field, is to be related to a kind of MHD specifically
Angular-rate sensor static noise measurement apparatus.
Background technology
With the development of modern spacecraft, especially navigated with high-resolution earth observation remote sensing satellite, survey of deep space remote sensing
Its device, the high-precision spacecraft that deep-space laser communication satellite is representative, it is extremely sensitive to micro-vibration disturbance effect, space structure
Micro-vibration perturbed problem turned into limit one that high-precision Spacecraft Attitude Control precision and stability further improves it is main
Factor.
Magnetohydrodynamics (Magnetohydrodynamics, MHD) angular-rate sensor have concurrently low noise, broadband,
The features such as miniaturization, long-life, acceleration is impacted insensitive.Compared to accelerometer, gyroscope, laser radar and optic communication
The methods of terminal, MHD angular-rate sensors be current inflight measurement spacecraft and the micro- angular oscillation information of payload most directly,
Effective and reliable instrument.
MHD angular-rate sensors are generally made up of sensing element part and pre-amplification circuit part.MHD angular speed senses
The main evaluation index of device is noise level, is divided into static noise and dynamic noise.MHD angular-rate sensor static noises are at its
Background noise under quiescent operation state, need to measure demarcation to this index before its use.
Utility model content
The utility model patent can not separate to solve existing MHD angular-rate sensors noise testing equipment and method
The problem of MHD angular-rate sensor sensing element static noises are with pre-amplification circuit static noise, and noise testing precision
It is low, introduce that noise is big, the problem of range is small, narrow bandwidth, it is proposed that a kind of MHD angular-rate sensors static noise measurement apparatus.
The static noise measurement apparatus can effectively suppress the coupled noise in measurement process, optimize the noise coefficient of measurement, improve
The measurement accuracy of noise；Flexible modulation signal amplification factor, effective expanded noise Measurement bandwidth.
The purpose of this utility model is achieved through the following technical solutions：
A kind of MHD angular-rate sensors static noise measurement apparatus, sensing element and preposition amplification are built-in with for measuring
The MHD angular-rate sensors of circuit, by impedance-matching transformer module, signal acquisition module, noise analysis module and power supply mould
Block forms, the impedance-matching transformer module to realize MHD angular-rate sensors sensing element and signal acquisition module it
Between impedance matching, amplify sensing element output signal to no additional noise；The signal acquisition module collection impedance matching becomes
Depressor module output signal；The noise analysis module is used for separation and Extraction noise contribution；The power module provides work electricity
Source voltage, prevent external noise from conducting the precision for noise analysis module, ensureing noise testing by power source path.
The impedance-matching transformer module is made up of impedance-matching transformer and secondary amplifier.
The signal acquisition module is made up of Signals Transfer Board and data acquisition card.
Compared with prior art, beneficial effect caused by the technical solution of the utility model is：
1st, the utility model creatively uses the scheme of step measurement noise, and this is prior art without the side used
Case.Step measurement noise can provide MHD angular-rate sensors sensing element, pre-amplification circuit and sensor entirety respectively
Static noise, the overall static noise of MHD angular-rate sensors can only be provided compared with prior art, realize MHD angular speed biography
The separation of sensor different piece static noise, more comprehensive detailed noise information can be provided.
2nd, it is quiet creatively to realize MHD angular-rate sensor sensing elements using impedance transformer module for the utility model
The measurement of state noise, MHD angular-rate sensor sensing element static noise information can not individually be extracted by solving prior art
Problem.
3rd, the impedance-matching transformer module in the utility model, signal acquisition module, noise analysis module and power supply mould
The noise information of block be, it is known that and using impedance matching, shielding, ground connection and pure power supply technology, optimize making an uproar for measurement apparatus
Sonic system number, introducing noise is small, close not gather signal to additional noise.Therefore the utility model can accurately extract MHD angles speed
The static noise information of sensor is spent, noise testing precision is high.
4th, the utility model impedance-matching transformer module flexible design is adjustable, can adjust MHD angular speed biography as needed
Sensor static noise measuring range and bandwidth, solve the problems, such as that prior art noise testing range is small, narrow bandwidth.
Brief description of the drawings
Fig. 1 is the MHD angular-rate sensor sensing element static noise measuring principle figures of the utility model patent.
Fig. 2 is the MHD angular-rate sensor pre-amplification circuit static noise measuring principle figures of the utility model patent.
Fig. 3 is the MHD angular-rate sensor entirety static noise measuring principle figures of the utility model patent.
Fig. 4 is the static noise extraction procedure flow chart of the utility model patent.
Fig. 5 is that the utility model patent has limit for length's static noise sample sequence segmentation method.
Fig. 6 is the MHD angular-rate sensor static noise power spectral densities of the utility model patent.
Fig. 7 is the MHD angular-rate sensor angular speed static noise spectrum densities of the utility model patent.
Embodiment
The utility model will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the static noise measuring principle figure of sensing element 101 of the MHD angular-rate sensors 1 of the utility model patent,
MHD angular-rate sensors 1 are shown in Fig. 3.MHD angular-rate sensors 1 are measurands, are not belonging to the part of the device.The MHD
Angular-rate sensor static noise measurement apparatus is by impedance-matching transformer module 2, signal acquisition module 3, noise analysis mould
Block 4 and power module 5 form.
Impedance-matching transformer module 2 is made up of impedance-matching transformer 201 and secondary amplifier 202.MHD angular speed passes
Voltage between the interior electrode 102 and external electrode 103 of the sensing element 101 of sensor 1 is transferred to the defeated of impedance-matching transformer 201
Enter end, an output end of impedance-matching transformer 201 is connected to secondary amplifier 202, and another output end is connected to outer
Shell earth terminal 203.Connection between sensing element 101 and impedance-matching transformer module 2 is realized by coaxial line.Signal acquisition mould
Block 3 is made up of Signals Transfer Board 301 and data acquisition card 302, signal of the data acquisition card 302 from NI companies in the present embodiment
Capture card PCI6289, the output end vo and earth terminal GND of impedance-matching transformer module 2 are connected respectively by Signals Transfer Board 301
The simulation positive input terminal ai+ and simulation ground AGND, the signal collected for connecing data acquisition card 302 are input to noise analysis module 4.
Connection between the output of impedance-matching transformer module 2 and data acquisition card 302 is realized by coaxial line.Noise analysis module 4
It is to be realized using the noise extraction procedure 401 of industrial computer 402, industrial computer IPC-610MB, and calculate noise power
Spectrum.The secondary amplifier 202 of impedance-matching transformer module 2 is powered by power module 5.The out-put supply of lithium battery 501 passes through
Switch change-over 502 and filter network, reuse low pressure difference linearity voltage regulation adjustor 503 and pure stabilized power source, positive-negative power are provided
With COM ends.The COM ends of power module 5, the earth terminal and signal acquisition of the secondary amplifier 202 of impedance-matching transformer module 2
The analogue ground AGND of card 302 is connected as one, and is realized by shielded cable.Because impedance-matching transformer module and signal are adopted
Collect the noise of module, it is known that the sensing element 101 itself of MHD angular-rate sensors 1 therefore can be extracted by the method
Static noise.
Fig. 2 represents the static noise measuring principle figure of pre-amplification circuit 105 of MHD angular-rate sensors 1, MHD angular speed
Sensor 1 is shown in Fig. 3.Two inputs of the pre-amplification circuit 105 of MHD angular-rate sensors 1 connect one 1 ohm of resistance
104, realize the short circuit of the input of pre-amplification circuit 105.Pre-amplification circuit 105 is both-end output mode, two output ends
Vo1+ connects simulation the positive-negative input end ai+ and ai- of data acquisition card 302 with Vo1-.The ground of pre-amplification circuit 105 is connected to
The simulation of data acquisition card 302 ground AGND.Pre-amplification circuit 105 two output end vos 1+ and Vo1- pass through one 1 kilo-ohm
Nurse resistance is connected to GND.Data acquisition card 302 is operated in Differential Input pattern.Pre-amplification circuit 105 is supplied by power module 5
Electricity.The analogue ground AGND at the COM ends of power module 5, the earth terminal of pre-amplification circuit 105 and data acquisition card 302 connects
It is connected in one.The static noise of the pre-amplification circuit of MHD angular-rate sensors 1 can be extracted by such a method.It is all
Connecting line is all shielded cable.
Fig. 3 represents the overall static noise measuring principle figure of the MHD angular-rate sensors 1 of the utility model patent.First
The sensing element 101 of MHD angular-rate sensors 1 is linked together with pre-amplification circuit 105, i.e., by sensing element 101
Interior electrode 102 and external electrode 103 are connected to two inputs of pre-amplification circuit 105.Screening cover 106 and sensing element 101
Shell have good electrical connection, the shell and screening cover 106 of sensing element 101 constitute the screen of pre-amplification circuit 105
Cover housing.The shell of aviation plug 107 has good electrical connection, the screen layer and aviation plug of shielding line with screening cover 106
107 have good electrical connection, and with being connected to the simulation of data acquisition card 302 AGND, so by the outer of sensing element 101
Shell, screening cover 106, the shell of aviation plug 107, with the simulation of data acquisition card 302 AGND is connected the screen layer of shielding line
Integrally, the COM ends of power module 5 and the earth terminal of pre-amplification circuit 105 are connected as one, and formation is effectively shielded and connect
Ground.Data acquisition card 302 works in difference modes, gathers the voltage signal between 105 two output ends of pre-amplification circuit.It is logical
The overall static noise of MHD angular-rate sensors 1 can be extracted by crossing such a method.All connecting lines are all shielded cable.
Fig. 4 is the static noise extraction procedure flow chart of the utility model patent.
Signal acquisition module samples to the continuous static noise signal xt of MHD angular-rate sensors 1, has obtained limit for length
Static noise sample sequence xn.
Such as Fig. 5, N point sequences are divided into L data segment first, it is allowed to which data segment is overlapping.Data segment can be expressed as：
xi(n)=x (n+iD),
N=0,1 ..., M-1
I=0,1 ..., L-1
Wherein, iD is the starting point of i-th of sequence, and M is the number of every segment data, and L is data segment number.
The static noise power spectral density of MHD angular-rate sensors 1 is calculated using Welch methods.Calculating cycle figure it
It is preceding that data segment is opened a window, the cyclic graph of windowingFor
Wherein, w (n) is window function, and U is the power normalization factor in window function, be may be selected to be
Obtain the static noise power spectral density of MHD angular-rate sensors 1For
Unit is V2/ Hz, as shown in Figure 6.
The constant multiplier SF of known MHD angular-rate sensors 1, the angular speed static noise of MHD angular-rate sensors 1 can be obtained
Spectrum density NER (f) is
Unit is (rad/s)2/ Hz, as shown in Figure 7.
Segmentation calculates the angular speed static noise root-mean-square value NER of MHD angular-rate sensors 1 as neededRMS
Wherein f1And f2It is the lower and upper limit of segment frequence respectively.
The static noise of generally use angular speed static noise root-mean-square value evaluation MHD angular-rate sensors 1 is horizontal, such as needs
Details, the angular speed static noise spectrum density of MHD angular-rate sensors 1 and the static state of MHD angular-rate sensors 1 can be analyzed
Noise power spectral density.
The utility model is not limited to embodiments described above.The description to embodiment is intended to describe above
With explanation the technical solution of the utility model, above-mentioned embodiment is only schematical, is not restricted.
In the case of not departing from the utility model aims and scope of the claimed protection, one of ordinary skill in the art is in this practicality
The specific conversion of many forms can be also made under new enlightenment, these are belonged within the scope of protection of the utility model.
Claims (3)
1. a kind of MHD angular-rate sensors static noise measurement apparatus, sensing element and preposition amplification electricity are built-in with for measuring
The MHD angular-rate sensors on road, it is characterised in that by impedance-matching transformer module, signal acquisition module, noise analysis module
Formed with power module, the impedance-matching transformer module is realizing that MHD angular-rate sensors sensing element and signal are adopted
Collect the impedance matching between module, amplify sensing element output signal to no additional noise；The signal acquisition module collection resistance
Anti- matching transformer module output signal；The noise analysis module is used for separation and Extraction noise contribution；The power module carries
For working power voltage, prevent external noise from conducting the precision for noise analysis module, ensureing noise testing by power source path.
A kind of 2. MHD angular-rate sensors static noise measurement apparatus according to claim 1, it is characterised in that the resistance
Anti- matching transformer module is made up of impedance-matching transformer and secondary amplifier.
A kind of 3. MHD angular-rate sensors static noise measurement apparatus according to claim 1, it is characterised in that the letter
Number acquisition module is made up of Signals Transfer Board and data acquisition card.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106950400A (en) * | 2017-04-28 | 2017-07-14 | 天津大学 | A kind of MHD angular-rate sensors static noise measurement apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950400A (en) * | 2017-04-28 | 2017-07-14 | 天津大学 | A kind of MHD angular-rate sensors static noise measurement apparatus and method |
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